Rotary-piston blower



Jan. 17, 1928. 1,656,867

F. PORSCHE ROTARY PIsToN BLOWER Filed Jan.14, 1925 Qlfgzemu PatentedJan. 17, 1928.Y Y y UNITED STATES PATENT OFFICE.

FERDINAND IPOBSCHE, STUTTGART-UNTERTURKHEIM, GERMANY, ASSIGNOR, BY MESNEASSIGNMENTS, T DAIMLER-BENZ AKTIENGESELLSCHAFT, OF BERLIN,

GERMANY.

. ROTARY-PISTON BLOWER.

Application led January 14, 1925, Serial No. 2,453, and in GermanyAugust 14, 1924.

This invention relates to blowers, more and d. The second element i, andlo respecparticularly of the Roots type. Theseblowtively of theseclutches connects with the ers are normally operated by rigid,unyieldtoothed wheels Z andV fm. Between the eleiiigor non-flexiblemembers connecting the ments z', g and 7270 platesaare inserted. The `55saine to an internal combustion engine or plates of the couplings arepressed together like prime mover and are often yused for inby means ofa spring o, through a ring p. troducing the air for combustion or theeX- The toothed wheels Z and m which mesh plosive mixture at a pressureabove atmostogether are mounted on vanes or pistons pheric into theworking cylinders of the eng and r which rotate in the casing s, and are60 gine, mounted in ball bearing t.

The object of the invention is to prevent The spring o for pressingtogether the dangerous oscillations especially resonancy elements of theclutch is of such strength oscillations being formed in the operatingthat under normal stresses the clutch does mechanism which may be causedfirstly by not yield, but a relative displacement of the 65 thetorsional elasticity of the driving shaft elements of the clutch takesplace when in and by retardations and accelerations of thc consequenceof resonaiicy oscillations or danvarying drive, and second by theself-oscilgerous stresses of themasses on the sudden lations of therotating parts of the blower. stoppage of the motor strains are set upVA further object of this invention is to inwhich might cause a fractureor injury of 70 sert positively closing members in the drivthe parts. Afriction clutch of any other ing mechanism which at a dangerousinomentsuitable type may be employed instead of a allow of a turning of theoscillating masses plate clutch. i relatively to one another and therebypre- I declare that what I claim is: vent any fracture or injury to theparts. 1. A rotary piston blower adapted to bef 175 In a Roots blowerthe invention may be driven by an internal combustion engine foremployed for example by mounting the pissupercharging the latter,comprising shafts` tons of the blower revolubly on piston coactingpistons, automatic clutches indeshafts coupled by gear wheels and topendently coupling said pistons with said arrange between the pistonshafts and the shafts, positive driving means for said 80 pistonscoupled therewith by means of gear shafts, and said pistons beingpositively wheels, friction clutches of any suitable type. gearedtogether.

One example of construction of the inveny 2. A rotary piston bloweradapted to be tion is illustrated diagrainatically iii two driven by aninternal combustion engine for figures in the accompanying` drawings.supercharging the latter, comprising shafts, 85

Figure 1 is an elevation showing an incoacting pistons freely supportedby said teriial combustion engine with a blower which shafts, automaticclutches independently couserves for charging the internal combustionpliiig said pistons, positive driving means engine at high pressure. nfor said shafts, and said pistons being posi- Figure 2 is a section onan enlarged scale tively geared together. 90 of the blower itself. 3. Arotary piston blower adapted to be The blower is for example, drivenfrom the driven by an internal combustion engine for crank shaft of theinternal combustion ensupercharging the latter, comprising shafts, gineby means of a toothed wheel a which coacting pistons on said shafts, anautomatic is in constant mesh with a toothed wheel o. clutch forming theconnection between one 95 On the hub of the toothed wheel o a furof thepistons and its shaft, positive drivther pinion c is mounted which gearswith ing means for said shafts, and said pistons a pinion d. The pinionc is mounted on the being positively geared together. shaft e and thepinion a3 on the shaft f. In testimony whereof I affix my signa- 'Iheshaft e and the shaft f carry one eleture. ment of friction clutches gand h respectively on the end opposite the toothed wheels b FERDINANDPORSCHE.

